1618874738 has 16 divisors (see below), whose sum is σ = 2626534680. Its totient is φ = 743907456.

The previous prime is 1618874737. The next prime is 1618874749. The reversal of 1618874738 is 8374788161.

It can be written as a sum of positive squares in 4 ways, for example, as 968267689 + 650607049 = 31117^2 + 25507^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1618874738.

It is not an unprimeable number, because it can be changed into a prime (1618874737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129995 + ... + 141902.

Almost surely, 2^1618874738 is an apocalyptic number.

1618874738 is a deficient number, since it is larger than the sum of its proper divisors (1007659942).

1618874738 is a wasteful number, since it uses less digits than its factorization.

1618874738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272141.

The product of its digits is 1806336, while the sum is 53.

The square root of 1618874738 is about 40235.2424871530. The cubic root of 1618874738 is about 1174.1883002422.

The spelling of 1618874738 in words is "one billion, six hundred eighteen million, eight hundred seventy-four thousand, seven hundred thirty-eight".